[Bug 1658750] Re: fails to add search directive to resolv.conf

[LaMont Jones]

Note that while there is no DOMAINSEARCH, DNSDOMAIN needs to translate
into something (domain or search directive), and only one of those will
be honored by the resolver (they overwrite each other, per the
specification).

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https://bugs.launchpad.net/bugs/1658750

Title:
  fails to add search directive to resolv.conf

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  When open-iscsi creates /etc/resolv.conf, it fails to add the domain
  name to resolv.conf:

  See also http://askubuntu.com/questions/873701/maas-node-unable-to-
  resolve-its-own-hostname/874005

  ubuntu at resolve:~$ cat /run/net-ens3.conf 
  DEVICE='ens3'
  PROTO='dhcp'
  IPV4ADDR='172.18.145.5'
  IPV4BROADCAST='172.18.147.255'
  IPV4NETMASK='255.255.252.0'
  IPV4GATEWAY='172.18.144.1'
  IPV4DNS0='192.168.133.18'
  IPV4DNS1='0.0.0.0'
  HOSTNAME=''
  DNSDOMAIN='maas.example.com'
  NISDOMAIN=''
  ROOTSERVER='172.18.144.1'
  ROOTPATH=''
  filename='pxelinux.0'
  UPTIME='8'
  DHCPLEASETIME='600'
  DOMAINSEARCH=''
  ubuntu at resolve:~$ cat /etc/resolv.conf
  # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  nameserver 192.168.133.18
  ubuntu at resolve:~$ dpkg -l open-iscsi | cat
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name           Version                           Architecture Description
  +++-==============-=================================-============-=================================
  ii  open-iscsi     2.0.873+git0.3b4b4500-14ubuntu3.3 amd64        iSCSI initiator tools

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